Article history: This paper presents a phy Received 25 January 2008 Received in revised form 25 September 2008 Accepted 27 September 2008

Energy limitation of a sensor network is a very important feature which distinguishes it from traditional networks and a number of methods to saving energy consumption have been studied in sensor networks. Most of those works have focused on Network, MAC or PHY layer and the lifetime of a sensor network cannot be pre-determined. But some sensor network might be able to survive for some specifie...

In this paper, I want to present two stories about kinds of empiricism; about the ways a science, experimental high energy physics, understands and enacts empirical research, and about how this understanding differs from that of another science, molecular biology. An ethnography of the empirical in different sciences has never been written. One reason for this surely lies in the fact that the m...

The recent interest in tackling the frequency-dependent aspects of communications is pushing a demand for spectrum awareness in simulation tools. Unfortunately, most current network simulators do not deal with this aspect in a satisfactory fashion. In this paper, we present a framework that we developed for the ns3 simulator with the aim of addressing this issue. We discuss the modeling assumpt...

UNLABELLED Rapid responses to changes in incident light are critical to the guidance of behavior and development in most species. Phytochrome light receptors in particular play key roles in bacterial physiology and plant development, but their functions and regulation are less well understood in fungi. Nevertheless, genome-wide expression measurements provide key information that can guide expe...

the authors describe case history of three patients who one-side progressive atrophy of the iris. two of these'; cases became later a glaucoma which could' not' be treated' even surgidily. third patient' had a betercebromi~'of the same side. the authors. discuss t4e different theories for the pathogenesi~ o~ the pl:imary. progl:lcssive att:«;>phy o( the iris bu~ believe that sy~pathetic theory ...

The establishment of secure secret keys ahead transmissions is one the key issues in field information security. security traditional cryptographic mechanisms seriously challenged by computing-intensive attacks, with fast growth high-performance computing. As an alternative, considerable efforts have been made to develop physical (PHY) layer measures recent years, such as link-signature-based (...